英语简单选择求详解As is recorded in history,silkworms were first raised in(what) is today Hebei Province.请问为什么括号里的不能选which呢?
问题描述：
英语简单选择求详解
As is recorded in history,silkworms were first raised in(what) is today Hebei Province.
请问为什么括号里的不能选which呢?
答